Same as the old original design except 14mm less wide. 

The gain is that you can place them snug together side by side, and hence can put overlapping  gridfinity bins.

In order to handle a lot of weight its not possible to go with only 2 modula adapters, so I cut 14mm off this one.

Snug fit

Side by side

Old original design

With the old original design the bins will not be able to be placed over two holders.